In /usr/bin/dh_xsf_substvars line 45:
      echo "xinpdriver:Depends=$inputdep" >> debian/$package.substvars
                                                    ^------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
      echo "xinpdriver:Depends=$inputdep" >> debian/"$package".substvars


In /usr/bin/dh_xsf_substvars line 46:
      echo "xinpdriver:Provides=xorg-driver-input" >> debian/$package.substvars
                                                             ^------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
      echo "xinpdriver:Provides=xorg-driver-input" >> debian/"$package".substvars


In /usr/bin/dh_xsf_substvars line 50:
      echo "xviddriver:Depends=$videodep" >> debian/$package.substvars
                                                    ^------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
      echo "xviddriver:Depends=$videodep" >> debian/"$package".substvars


In /usr/bin/dh_xsf_substvars line 51:
      echo "xviddriver:Provides=xorg-driver-video" >> debian/$package.substvars
                                                             ^------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
      echo "xviddriver:Provides=xorg-driver-video" >> debian/"$package".substvars

For more information:
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...